The monthly car safety check: a 10 minute walkaround, step by step
A simple routine for tires, lights, fluids and glass that catches problems early
Most car problems give a warning before they cause a crash. A tire slowly loses air. A wiper blade starts to streak. A brake light burns out without you noticing. A short monthly check catches these problems while they are still small and cheap to fix.
The warning systems in newer cars help, but they have limits. The federal rule for tire pressure warnings only requires the light to come on when a tire is at least 25 percent low [1]. NHTSA says the warning system is not a substitute for regular tire care [2]. Your eyes, a $5 gauge and 10 minutes a month fill that gap.
This guide walks you through the check in the order that saves the most time. You do not need any mechanical skill. If you find something you cannot fix, you will know what to tell a shop.
What you need
Before you start
Park on flat, level ground, away from traffic. Turn the engine off and set the parking brake. Do the check before you drive for the day, or after the car has sat for at least three hours. That way the tires are cold and the engine is cool [2].
Keep hands, hair and loose clothing away from belts and fans under the hood. Never open the radiator or coolant cap on a warm engine.
Step 1: Walk around the car (1 minute)
Walk slowly around the whole car. Look for:
- Puddles or drips under the car. Note the color. A dark brown or black oily spot can mean engine oil. A yellow green, blue or orange spot can mean coolant. A red oily spot can mean transmission or power steering fluid [3].
- Tires that look low compared with the others.
- Cracked or loose mirrors.
- Chips or cracks in the windshield, especially in front of the driver.
- Dirty or cloudy headlights, taillights and camera lenses.
Clear water dripping in warm weather is usually just the air conditioning [3].
Step 2: Check the tires (3 minutes)
Tires are the most important part of this check. A NHTSA study of crashes found that tire problems were three times as likely to come right before a crash when a tire was 25 percent or more underinflated [4]. Only 19 percent of drivers keep their tires properly inflated [2].
- Find the right pressure. It is on the label inside the driver’s door frame and in your manual. Do not use the number on the tire sidewall. That is the maximum the tire can hold [2].
- Remove the valve cap and press the gauge firmly onto the valve stem.
- Read the gauge and compare it with the label. Front and rear numbers may differ.
- Add air if the tire is low. Recheck after filling.
- Replace the valve cap. It keeps dirt and moisture out of the valve.
- Repeat for every tire, including the spare if you have one [2].
Next, test the tread. Put a quarter upside down in a groove. If you can see all of Washington’s head, the tread is down to about 4/32 inch, and AAA says it is time to shop for new tires [5]. Check a few spots across each tire, because tires can wear unevenly.
Last, run your eyes over each sidewall. A bulge, a deep cut or showing cords means the tire is not safe to drive on [2].
Step 3: Check every light (2 minutes)
You cannot see most of your own lights from the driver’s seat. Other drivers depend on them to know what you are doing.
With a helper:
- Turn on the headlights. Check low beams, then high beams.
- Press the brake pedal. Your helper checks all brake lights, including the high center light.
- Turn on the left signal, then the right. Check front, rear and side signals.
- Turn on the hazard lights.
- With your foot on the brake and the parking brake set, shift into reverse. Check the reverse lights.
- Check the license plate light.
No helper? At dusk, back up close to a garage door or a store window and watch the reflection. A turn signal that blinks much faster than normal often means a bulb on that side is out [6].
Step 4: Look under the hood (3 minutes)
Your owner’s manual has a picture showing where each item is. Many of the caps and tanks are marked with symbols or bright colors.
Engine oil. AAA suggests checking the level about once a month [7]. If your car has a dipstick, pull it out, wipe it clean, push it all the way back in, then pull it out again. The oil should be between the two marks. Some newer cars have no dipstick and show the level on a dashboard screen instead. Add only the oil type listed in your manual.
Coolant. Look at the see through overflow tank with the engine cold. The level should be between the low and full marks. Low coolant usually means a leak, so do not just keep adding it.
Brake fluid. Look at the level in the small see through tank, usually near the driver’s side. If it is low, have the brakes checked. A falling level can mean worn pads or a leak.
Washer fluid. Top it off. This is the one fluid every driver should fill. Use a fluid rated for freezing weather in winter [8].
Battery. Look for loose cables or white or green crust on the terminals. Make sure the battery is held down firmly [9].
Belts and hoses. Shine your flashlight on them. Look for cracks, fraying, bulges or soft spots.
Step 5: Check the inside (1 minute)
- Warning lights. When you start the car, several lights may come on briefly as a self check. In Kia models, for example, the air bag light should go out after about six seconds [10]. A light that stays on needs attention.
- Seat belts. Pull each belt out, let it retract and give it a quick tug. It should lock. Make sure each buckle latches and releases cleanly [11].
- Floor mat. The driver’s mat should be hooked onto its clips and should not touch the pedals [8].
- Loose items. Remove anything that could roll under the pedals.
- Wipers and washers. Spray the windshield. Blades should wipe clean without streaks or chatter [12].
- Horn and defroster. Give a quick tap of the horn and run the defroster for a moment.
Step 6: Check for recalls (twice a year)
Every six months, enter your license plate or VIN at NHTSA.gov/recalls. NHTSA suggests checking when the clocks change for daylight saving time [13]. Recall repairs are free.
Write it down
Keep a simple note on your phone or a card in the glove box. Write the date, the mileage and what you found. Over time, you will see patterns, such as a tire that always needs air. That is a clue to a slow leak.
How to read your maker's service schedule
The monthly check covers what you can see. Your owner’s manual covers the work that needs tools, such as oil changes and fluid replacement. Schedules can look confusing at first. These terms appear in most of them.
Comparison compiled by Safety Behind the Wheel Foundation
Common service schedule terms
| Term | What it means |
|---|---|
| Inspect or check | Look at the part and replace it only if it is worn or damaged |
| Replace or change | Replace it at this interval, even if it looks fine |
| Months or miles, whichever comes first | Service is due at the first one you reach. A car driven little still needs service by date |
| Special or severe conditions | A tougher schedule with shorter intervals for hard driving |
| Oil life reminder | A dashboard display that estimates oil life from how you drive |
Source: Based on manufacturer maintenance guides [14] and AAA guidance [7].
Which schedule fits you? Many drivers assume they fall under the normal schedule. AAA says you may need the tougher one if you often make short trips of 5 miles or less. The same goes for extreme heat, cold or dust, stop and go traffic, and towing or heavy loads [7]. That describes a lot of everyday driving.
Inspect versus replace. One Lexus guide, for example, lists tires, brake pads and wiper blades as items to inspect. Engine oil, brake fluid and the cabin air filter are replaced at set intervals [14]. A shop that wants to replace an “inspect” item should be able to show you why.
Oil life reminders. These systems adjust to your driving, but AAA notes they are not always exact. The owner’s manual remains your main guide [7].
When you find a problem
Sort what you find into three groups:
- Fix before driving: a tire with a bulge or exposed cords, a soft or sinking brake pedal, a red warning light, or fuel or brake fluid leaking.
- Fix this week: a burned out light, worn wipers, low tire pressure that keeps coming back, or a new oily drip.
- Mention at your next service: small drips, minor noises, or a part that looks worn but still works.
The FTC suggests describing problems to a shop in detail, such as when the noise happens and what it sounds like [3]. Your notes from the monthly check make that easy.
Your monthly checklist
Frequently asked questions
My car is new. Do I still need a monthly check?
Yes. New cars still lose tire pressure, pick up nails and burn out bulbs. Tires lose some air every month on any car.
Can I check tire pressure at the gas station?
You can, but your tires will be warm if you drove there. Warm tires read higher than cold ones. If the pressure is low, add air. Do not let air out of warm tires to reach the label number. Recheck when they are cold [2].
What if I am not comfortable opening the hood?
Do the tire, light and inside checks yourself. Ask your shop to check the fluids at each visit. Many quick lube shops check levels as part of an oil change.
How long does this really take?
About 10 minutes once you have done it a couple of times. The first time may take 20 minutes while you find everything.
Related articles
- Vehicle maintenance for safety: tires, brakes, lights and warning signs
- How to check your tires: pressure, tread, damage and repairs
- Headlights, wipers and mirrors: how to see clearly and be seen
- Car fluids, battery, filters, belts and hoses: what to check yourself
- Finding a trustworthy repair shop: estimates, repair priorities and records
Sources and further reading
- 1Federal Register. Federal Motor Vehicle Safety Standards; Tire Pressure Monitoring Systems final rule (FMVSS 138). April 8, 2005. govinfo.gov/…/05-6741.pdf
- 2NHTSA. Tires. nhtsa.gov/vehicle-safety/tires
- 3Federal Trade Commission. Auto Repair Basics. consumer.ftc.gov/…/0211-auto-repair-basics
- 4Automotive Fleet. NHTSA Report Says Low Tire Tread Depth and Underinflation Increase Collision Chances. May 10, 2012. automotive-fleet.com/…/nhtsa-report-says-low-tire-tread
- 5AAA Newsroom. Tread Lightly: Worn Tires Put Drivers at Risk. June 7, 2018. newsroom.aaa.com/…/tread-lightly-worn-tires-drivers
- 6Cars.com. Why Is My Turn Signal Blinking Fast? cars.com/…/why-is-my-turn-signal-blinking-f
- 7AAA. How Often Should You Change Engine Oil? aaa.com/…/how-often-should-you-change-engi
- 8NHTSA. Winter Weather Driving Tips 2023 to 2024. nhtsa.gov/…/Winter-Weather-Driving-Tips-2023
- 9AAA. How Long Do Car Batteries Last? aaa.com/…/how-long-do-car-batteries-last
- 10Kia owner’s manual. Air bag warning light. ownersmanual.kia.com/…/t00075.html
- 11Hyundai owner’s manual. Seat Belt Safety Precautions. ownersmanual.hyundai.com/…/id2366ac71732.html
- 12AAA, The Auto Club Group. When to Replace Your Windshield Wipers and Why It Matters. acg.aaa.com/…/when-to-replace-your-windshield-
- 13NHTSA. NHTSA Urges Everyone to Check Recalls During Vehicle Safety Recalls Week. March 4, 2024. nhtsa.gov/…/nhtsa-urges-everyone-check-recal
- 14Toyota Motor Sales. Lexus RC F scheduled maintenance and warranty guide (L-MMS-23RCF). assets.sia.toyota.com/…/L-MMS-23RCF.pdf
This article reflects the safety priorities of vehicle maintenance and crash prevention. It is general education, not mechanical advice. Follow your owner’s manual for your vehicle and see a qualified technician for repairs. Reviewed November 2026.
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